As confirmed in a press release today, Apple has just released iOS 4.2 final version for iPhone 4/3GS/3G, iPod Touch 4G/3G/2G & iPad (Wifi+3G). iOS 4.2 brings over 100 new features from iOS 4.0, 4.1 and 4.2 to iPad including AirPlay, AirPrint, Multitasking, Folders, Unified Inbox and Find My iPhone service.iOS 4.2 AirPrint feature will allow you to print documents, emails, photos and web-pages over a Wifi connection with your Apple iOS device. In order to print any media from your iPhone, iPod Touch or iPad, you must first configure AirPrint on your PC or Mac. However if you have HP ePrint enabled printer, you can directly print any media from your iDevice without any additional setup over local wireless networks.

With iOS 4.2 AirPlay feature, you will be able to stream music, photos and videos directly from your iPhone, iPod Touch or iPad to your Apple TV. With AirPort Express support you will be able to stream any media directly to the stereo or powered speakers around you.

Find My iPhone service which was previously available for MobileMe subscribers is now free. You can download Find My iPhone app for your iPhone, iPod Touch and iPad from App Store for free. Find My iPhone service allows you to locate your missing iDevice on a map and have it display a message or play a sound. You can also lock or wipe data from your lost device to protect your privacy.

Other features of iOS include: the ability to rent TV episodes directly to iPad, the ability to find and highlight a specific word on a web-page using native Safari browser, new device management capabilities and improved enterprise integration.

Supported Devices by iOS 4.2:

Note that iPhone 3G and iPod Touch 2G users will not be able to use Multitasking feature of iOS 4.2 due to processor power limitation. Moreover free Find My iPhone service is available for iPhone 4, iPod Touch 4G and iPad users only.

To update your iDevice to iOS 4.2, just connect it to your PC or Mac through USB cable and launch iTunes. You will see an update prompt from iTunes as shown in the screenshot below, just hit the "Download and Update" button to update the firmware on your device.

Note: If you rely on a jailbroken or unlocked iOS device, DO NOT upgrade to iOS 4.2 as it will leave your device in an unjailbroken state. Upgrading the iPhone firmware to iOS 4.2 will also upgrade its baseband version which is yet to be unlocked by iPhone Dev-Team.

i have a 2G ipod touch 8gb and ive jailbroken it twice before with greenpois0n and redsn0w i used redsn0w first in like 2010 then greenpois0n last year but i dont remember what versions they were so i could redownload the tools onto my new computer and i sold the last one so i got the newer versions and neither work with greenpois0n i jalbroke it but cydia wouldnt work when i went into it it crashed and with redsn0w it keeps saying that it cant recognize the ipsw file you had me download or any other website i download it from they are all the same ipod2,1_4.2.1_8c148_restore.ipsw so i dont know whats wrong email me your thoughts Joeroach1996@hotmail.com

You will need to update your BB to the iPad BB first. Read this http://bit.ly/lccwoE. Make sure that your aware of the consequences / dangers of updating to the iPad BB & only then continue. Google the same if necessary.

I saved my shsh blobs through cydia on my iphone 4 but Im wanting to jailbreak my ipad. My iphone is jailbroken on 4.3.3 but I noticed that apple isnt signing it anymore. What is the easiest way to downgrade and jailbreak my ipad?

Sorry Ken, you must backup your iPhone apps by syncing them with iTunes before you may upgrade to iOS 4.2.1. Also note that in-order to upgrade to iOS 4.2.1, you must have iOS 4.2.1 SHSH blobs saved in Cydia. If your SHSHs are saved, install AppSync from Cydia and backup your iPhone through iTunes. Once done, use PwnageTool, Sn0wbreeze or GreenPois0n to jailbreak your iPhone on iOS 4.2.1.